Hybrid Photovoltaic Thermal (PV/T) Air and Water Based Solar Collectors Suitable for Building Integrated Applications
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1 American Journal of Environmental Sciences 5 (5): , 2009 ISSN X 2009 Science Publications Hybrid Photovoltaic Thermal (PV/T) Air and Water Based Solar Collectors Suitable for Building Integrated Applications Adnan Ibrahim, Goh Li Jin, Roonak Daghigh, Mohd Huzmin Mohamed Salleh, Mohd Yusof Othman, Mohd Hafidz Ruslan, Sohif Mat and Kamaruzzaman Sopian Solar Energy Research Institute, University Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia Abstract: Problem statement: Experiments have been conducted to investigate the effect of mass flow rates on the electrical, thermal and combined of photovoltaic thermal efficiencies of the hybrid s. Approach: Two photovoltaic thermal solar s were designed and fabricated. The first, known as spiral flow absorber, designed to generate hot water and electricity. The second, known as single pass rectangular tunnel absorber designed to generate hot air and electricity. Both absorber s were fixed underneath the flat plate single glazing sheet of polycrystalline silicon PV module. Water was used as a heat transfer medium in spiral flow absorber and air for the Single pass rectangular tunnel absorber respectively. Results: The experiment results showed that the single flow absorber generates combined PV/T efficiency of 64%, electrical efficiency of 11% and power maximum achieved at W. Moreover, Single pass rectangular tunnel absorber generated combined PV/T efficiency of 55%, electrical efficiency of 10% and maximum power of W. Conclusion/Recommendations: The best mass flow rate achieved for spiral flow absorber is kg sec 1 at surface temperature of 55% and kg sec 1 at surface temperature of 39 C for single pass rectangular absorber. It was recommended for PV/T system to further improve its efficiency by optimizing the contact surfaces between the solar panel (photovoltaic module) and the tubes underneath and also recommended to use other type of photovoltaic cell such as amorphous silicon cell that posses the black mat surfaces property that will improve it thermal absorption. Key words: Photovoltaic Thermal (PV/T), thermal and electrical efficiency, absorber s INTRODUCTION Energy is required in almost every aspect of human activities and development of any nation in this world. Increasing fossil fuel price, energy security and climate change have important bearings on sustainable development of any nation. The increase in fossil fuel prices has created an inflationary pressure in the economic field which influenced the increase in interest rates and investments [1]. One of the drastic approaches taken by researchers all over the world is to introduce a backup or replacement source of energy. One of the promising energy is the renewable energy technologies -in this case, solar energy, which commonly known as Photovoltaic technology (PV). The photovoltaic technology has its own advantages comparing to other sources, such as, operate in noiseless mode, totally clean and green energy, highly credibility system with life span expectation between years and very low maintenance system. There are many applications of photovoltaic technology, such as, for heating purposes for water and space, solar drying and building integrated skins (facades). In heating, photovoltaic module is combined with solar thermal absorber to produce a hybrid system. It is known fact that the efficiency conversion of solar energy to electrical energy using photovoltaic cells is limited by several factors. Firstly, conversion efficiency falls as the temperature of the photovoltaic cells rise and secondly, the photovoltaic cells are only responsive to a portion of solar spectrum, which is equivalent or higher than the band gaps of the solar radiation. This is one of the main reason that make the usage of photovoltaic in tropical countries is less choice [2]. Photovoltaic Thermal technology (PV/T) has been developed since 70 s. Basically the solar energy technology can be broadly classified into two systems; photovoltaic energy system and thermal energy system. The term PV/T refers to solar thermal s that use PV cells as an integral part of the absorber plate. Corresponding Author: Adnan Ibrahim, Solar Energy Research Institute, University Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia Tel: Fax:
2 The system generates both thermal and electrical energy simultaneously. The first air hybrid was employed by the University of Delaware. The hybrid which was integrated by Böer et al. [3] integrate the solar to building roof, known as Solar One house. Since the first hybrid being studied, variety of studies about the PV/T system has been carried out throughout the world. The studied mostly focusing on the air and water based as the medium to the heat transfer [4-8]. Amongst the PV/T solar s that being studied, the most popular is the air type solar with photovoltaic module, even though it is most popular, this type of has less in usage compared to the water s [9]. The PV/T solar system has been designed to generate the electricity and at the same time to produce hot air and hot water. The hot air and hot water gained can be used for other purposes in low heat temperature processes. Wolf [10] analyzed the performance of the combination of heating and photovoltaic power systems for residences using Hottel-Whillier model [11], he analyzed the combination of photovoltaic and thermal flat plate s with the traditional hot water system and PV module. He concluded that the system was technically feasible and cost effective. Zondag et al. [12] reviewed various concepts of combined PV-thermal technologies by introducing and evaluating nine different designs, ranging from the complicated to the simpler one, in order to investigate the maximum yield. They concluded that the design of the channel below the transparent PV, with PV-on-sheet and tubes design gives the best efficiency overall. Bergene et al. [13] perform theoretical examination of a flat plate solar model that integrated with solar cells. They concluded that, the system can produced approximately about 60-80% efficiency. Huang et al. [14] have developed PV/T system using a polycrystalline solar PV panel, adopted to be combined with a plate. They suggested that the plate must be directly attached to the PV panel using the thermal grease, for better contact. He et al. [15] recently studied the hybrid PV/T system which used natural convection to circulate the water, adopting a flat-box absorber design. The study shows increasing of daily thermal efficiency up to 40%. The aim of this study is to study the influence of various mass flow rates to the efficiency of the s. This research provides experimental results and could be considered useful to estimate the accuracy of various mass flow rates for both s. Results from the results and observation of the experiment, enable us to justify the s which are able to Am. J. Environ. Sci., 5 (5): , convert solar energy simultaneously into electrical energy and thermal energy in such a way that the two processes are compatible and integrated. Collectors configuration: Spiral flow absorber : In this experiment, a specially made Spiral flow absorber and Single pass rectangular tunnel absorber have been designed and evaluated. The Spiral flow, as shown in Fig. 1, is made of rectangular hollow tubes of stainless steel material with dimension of mm. The tube was connected using a welding method. The absorber should have a single unilateral channel for the water to flow in it with the size of mm before it is assembled underneath the standard PV module with the size of 1 m height and 0.65 m length. As shown in Fig. 2, the photovoltaic module has been represented as a flat plate single glazing sheet of polycrystalline silicon with single glazing sheet. The Spiral flow absorber is designed in the form of continuous coil or tube configured. The spiral coil has at least one inlet and outlet to allow fluid to enter and to exit from coil respectively. The inlet and the outlet of the spiral coil are arranged further away to the entre point of the spiral. This will allow the water to flow in reversed direction and covered the entire photovoltaic module. Water with lower temperature enters the coil and travel through the spiral coil into the centre point and travel away from the centre point leaving the coil as hot water. The hot water can be consumed or stored for later use. In this way solar radiation energy can be fully utilized. Fig. 1: The design of Spiral flow absorber Fig. 2: The perspective view of Spiral flow absorber
3 Fig. 3: The design of Single pass rectangular tunnel absorber Fig. 5: The solar panel under the halogen lamps simulator Fig. 4: Blower and photovoltaic thermal ducting connection Single pass rectangular tunnel absorber : As shown in Fig. 3, Single pass rectangular tunnel absorber is fabricated from 39 units of aluminium hollow rectangular tubes, with the size of cm. The tubes are then arranged in parallel, stacking side by side, to form a tunnel configuration. The tunnel design comprised of 1 m height and 0.65 m length and has been inserted underneath the standard PV module. The tunnel rectangular tubes have been placed underneath the PV module act as heat conductor. Once it is place underneath the PV module, an insulator is used to cover the tunnel to prevent heat loss to surrounding. Referring to Fig. 4, ducting has been designed and fabricated and connected to blower. A heater made of 2 halogen lamps was place inside the ducting to stabilize the air temperature that going into the. MATERIALS AND METHODS Experimental set-up: In this experiment, a standard solar panel model, which rating at 80 W power under 800 W m 2 solar radiation, is used. As seen in Fig. 5, the solar PV/T s are tested under 23 simulator halogen lamps. The experiment was conducted in control environment (constant room temperature of 25 C) and was tested under 5 different mass flow rates. Both s are tested with and without the absorbers to compare the differences. Solar radiation from experiment lamps are set approximately at 800 W m 2. Mass flow rates for Single flow absorber are set ranging from kg sec 1. For Single pass rectangular tunnel absorber, the mass flow rates are set ranging from kg sec 1. The tests are carried out by setting the solar radiation to the designated power and once it reaches steady state condition, the medium (water and air) are flowed through the absorbers. The parameters measured are: Current, I (A), Voltage, (V), short circuit current, I sc (A), open circuit voltage, V oc (V) and temperature, T ( C) are measured every 90 min. Data collected are used to calculate the electrical efficiency and thermal efficiency for both s. RESULTS AND DISCUSSION The performance of s can be depicted by the combination of efficiency expression [15]. It comprised of the thermal efficiency η th and the electrical efficiency η e. The total efficiencies, which is known as combined PV/T efficiency η o is used to evaluate the overall performance of the system: η o = η thermal +η electrical The thermal performance η th of the PV/T unit is evaluated for its thermal and photovoltaic performance, as such, the derivation of the efficiency parameters based on the Hottel and Whillier Equations [11] were used. For both absorber s efficiency, the fluid and air mass flow rates can be calculating using the equation below: mɺ = ρav av Where: mɺ = The mass flow rate ρ = The density of the fluid or air drain input area V av = The fluid or air velocity, determined using voltage regulator and blower in the case of air 620
4 I sc and V oc can be achieved by connecting directly to the multimeter, which later connected directly to the solar panel. I m and V m. Where I m and V m are from power maximum, P m. Power, P is the result of current, I (V). The thermal efficiency of the can be expressed by [16] : Am. J. Environ. Sci., 5 (5): , 2009 mc ɺ p T ηth = 100% A G p T Where: mɺ = Mass flow rate (kg sec 1 ) C p = Specific heat of the cooling medium (J kg 1 C 1 ) = Differences between fluid or air outlet temperature (K), (T o ) and fluid or air inlet temperature (K) (T i ) A p = Area covered by absorber G T = Solar radiation at NOCT (irradiation level 800 W m 2, wind velocity 1 m sec 1, ambient temperature at 26 C taken every 90 min) Fig. 6a: Electrical efficiency and surface temperature versus mass flow rate for Spiral flow absorber Performance of electrical efficiency, η el is shown as below: Im Vm ηel = 100% A G p T Where: I m = The maximum current (A) V m = Maximum voltage (V) The experiment results in Fig. 6a and b shows the electrical and thermal efficiency versus the surface temperature and mass flow rate for Spiral flow absorber. The result shows that when mass flow rate increases, the surface temperature decrease and at the same time the efficiencies for electrical and thermal increase. In this experiment, the data shows that at the surface temperature of 55 C and mass flow rate of kg sec 1, the absorber generates combined PV/T efficiency of 64%, with electrical efficiency of 11%. Figure 7a and b shows the electrical and thermal efficiency versus the surface temperature and mass flow rate for the Single pass rectangular tunnel absorber. The result is similar to the Spiral flow absorber. For Single pass rectangular tunnel absorber, at a surface temperature of 39 C and mass flow rate of kg sec 1, generates combined PV/T efficiency of 55%, with electrical efficiency of 10%. 621 Fig. 6b: Thermal efficiency and surface temperature versus mass flow rate for Spiral flow absorber Fig. 7a: Electrical efficiency and surface temperature versus mass flow rate for Single pass rectangular tunnel absorber Figure 8a and b show the dependence of electrical, thermal and combined PV/T efficiency on the mass
5 flow rate of the Spiral flow and Single pass rectangular tunnel absorber respectively. The efficiencies approach steady state values as the mass flow rate increases. In this experiment, it is seen that for Single pass rectangular absorber, the steady state efficiency is reached at a threshold mass flow rate of kg sec 1 while for Spiral flow absorber ; the threshold mass flow rate is kg sec 1. For Spiral flow absorber, the error analysis for mass flow rate at kg sec 1 was ±0.004 kg sec 1, error analysis for electrical efficiency was 11±3.36% and thermal efficiency was 52±0.10%. For Single pass rectangular absorber, the error analysis for mass flow rate at kg sec 1 was ± kg sec 1, error analysis for electrical efficiency was 10±4.04% and thermal efficiency was 45±0.28%. Error analysis for thermal efficiency was lower then electrical efficiency and its because the mass flow rate used in thermal calculation had smaller error compare to current and voltage used in electrical. The behaviour of the I-V curve for the two s is shown in Fig. 9 along with the bare plate solar panel for comparison purposes. This can be explained based on the experimental observations given in Fig. 6a and b and 7a and b. The open circuit voltage (V oc ), short circuit current (I sc ) of the Spiral flow absorber are the highest because of the low surface temperature of the panel due to the medium used. For Single pass rectangular tunnel, the short circuit current (I sc ) is less than the one in Spiral flow absorber but the open circuit voltage (V oc ) is about the same. Fig. 7b: Thermal efficiency and surface temperature versus mass flow rate for Single pass rectangular absorber Fig. 8b: Combined PV/T efficiency versus various mass flow rates for Spiral flow absorber Fig. 8a: Combined PV/T efficiency versus various mass flow rates for Single pass rectangular tunnel absorber 622 Fig. 9: I-V curve for Bare plate solar panel, Single pass rectangular tunnel and Spiral flow absorber
6 This is due to the slightly lower temperature of the medium used giving rise to a lower surface temperature of the panel. From the observation, the result shows that the Spiral flow design has the power maximum of W and the Single pass rectangular tunnel absorber design with tunnel have the maximum power of W. Both s are being compared to a bare plate solar panel that giving a power maximum of only W. CONCLUSION The photovoltaic solar comprises of a combined photovoltaic module (PV) and an absorber for building integrated Photovoltaic Thermal (PV/T) application, have been integrated. The optimum operating temperature of the photovoltaic module and efficiency conversion have been obtained, determined and maintained. From this experiment, the results indicated that Spiral flow absorber at temperature of 55 C (Panel temperature), achieving the best mass flow rate at kg sec 1 and generates combined PV/T efficiency of 64%, with 11% of electrical efficiency and power maximum of W. Single pass rectangular absorber achieved it best mass flow rate at kg sec 1, at surface temperature of 392 C, generates combined PV/T efficiency of 55%, with 10% of electrical efficiency and maximum power of W. It is recommended for PV/T system to further improve its efficiency by optimizing the contact surfaces between the solar panel (photovoltaic module) and the tubes underneath. It is also recommended to use other type of photovoltaic cell such as amorphous silicon cell that posses the black mat surfaces property that will improve it thermal absorption. REFERENCES 1. Sadorsky, P., Oil price shocks and stock market activity. Energy Econ., 21: html 2. Azhari, A.W., K. Sopian, A. Zaharim and M. Al Ghoul, A new approach for predicting solar radiation in tropical environment using satellite images-case study of Malaysia. WSEAS. Trans. Environ. Dev., 4: N.pdf 3. Böer, K.W. and G. Tamm, Solar conversion under consideration of energy and entropy. Solar Energy, 74: Bazilian, M.D., Photovoltaic cogeneration in the built environment. Fuel Energy Abst., 43: DOI: /S x(01) Garg, H.P. and R.K. Agarwal, Some aspects of a PV/T /forced circulation flat plate solar water heater with solar cells. Energy Conver. Manage., 36: Tripanagnostopoulos, Y., T. Nousia, M. Souliotis and P. Yianoulis, Hybrid photovoltaic/thermal solar systems. Solar Energy, 72: Tonui, J.K. and Y. Tripanagnostopoulos, Performance improvement of PV/T solar s with natural air flow operation. Solar Energy, 82: Ibrahim, A., M.Y. Othman, M.H. Ruslan, M.A. Alghoul, M. Yahya, A. Zaharim and K. Sopian, Performance of photovoltaic thermal (PVT) with different absorbers design. WSEAS. Trans. Environ. Dev., 5: Niccolo, A., C. Giancarlo and V. Francesco, Design, development and performance monitoring of a Photovoltaic-Thermal (PVT) air. Renew. Energy, 10: DOI: /j.renene Wolf, Martin, Performance analyses of combined heating and photovoltaic power systems for residences. Energy Conver., 16: Florschuetz, L.W., Extension of the Hottel- Whillier model to the analysis of combined photovoltaic/thermal flat plate s. Solar Energy, 22: DOI: / X(79) Zondag, H.A., Flat-plate PV-Thermal s and systems: A review. Renew. Sustain. Energy Rev., 12:
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